Update Conan.cmake

Update to the latest available version to overcome some windows related problems during build.

Author: Jason5480

src/Conan.cmake

@@ -6,7 +6,7 @@ macro(run_conan)
   if(NOT EXISTS "${CMAKE_BINARY_DIR}/conan.cmake")
     message(STATUS "Downloading conan.cmake from https://github.com/conan-io/cmake-conan")
     file(
-      DOWNLOAD "https://raw.githubusercontent.com/conan-io/cmake-conan/0.17.0/conan.cmake"
+      DOWNLOAD "https://raw.githubusercontent.com/conan-io/cmake-conan/0.18.1/conan.cmake"
       "${CMAKE_BINARY_DIR}/conan.cmake"
       EXPECTED_HASH SHA256=3bef79da16c2e031dc429e1dac87a08b9226418b300ce004cc125a82687baeef
       # TLS_VERIFY ON # fails on some systems